Synthesis Of Graphite Oxide And Graphene Oxide Polymers And Its Adsorption Properties

Based on the review of the development of modification of graphite oxide andgraphene oxide, the dissertation included following contents:1. The graphite oxide was prepared from powdered graphite via Hummers method.It was characterized by the methods of FT-IR, XRD and SEM. The results show thatgraphite oxide contains various oxygen-containing functional groups such as C-OH,-COOH and C-O-C which make the layer spaces increase. Adsorption experimentsindicate that graphite oxide displays outstanding adsorption ability for p-nitrophenol.Under the conditions of adsorption temperature at298K and pH at7.0, adsorptivecapability of graphite oxide is up to80.69mg/g,6.1times of graphite powder. Theinvestigation of adsorption isotherms and thermodynamic functions shows thatadsorption can be greatly described by the Langmuir isothermal equation and is aspontaneous and exothermic process. Kinetic study shows that adsorption can be fittedby the second-order dynamic equation.2Using graphite oxide as raw material, sonicated to obtain graphene oxide.Graphene oxide bearing ?-cyclodextrin was prepared by crosslined graphene oxide with?-cyclodextrin by epichlorohydrin. It was characterized by methods of Ramanspectroscopy, FT-IR and SEM. Graphene oxide bearing ?-cyclodextrin displays goodadsorption ability for p-nitrophenol. Under the conditions of adsorption temperature at313K and pH at8.0, adsorptive capacity is up to117.28mg/g. Adsorption isothermsand thermodynamic functions investigated show that Langmuir isotherm can fit theadsorption better (R2>0.995) and adsorption is a spontaneous, endothermic and randomprocess. Kinetics studies show the adsorption is a pseudo-second-order process.3Using“one-pot”synthesis method, was prepared successfully by modifiedgraphene oxide with salicylaldehyde o-phenylenediamine, then crosslinked withepichlorohydrin, and finally immobilized with ?-cyclodextrin. FT-IR, XRD, Raman,SEM combined with EDX were used to characterize polymer. Adsorption properties ofsalicylaldehyde o-phenylenediamine Schiff modified graphite oxide immobilized?-cyclodextrin polymer for metal ions and p-nitrophenol were studied. Adsorptionexperiments show that the metal ions and p-nitrophenol can be adsorbed, especially for Pb2+adsorption better. Measurment the polymer dosage, temperature and acidityimpacts on the adsorption, investigated the adsorption properties of polymer which formetal ions and p-nitrophenol, simultaneously. The results shows that the adsorption canbe reached equilibrium in2h at temperature of313K and pH=6.0. Adsorptivecapacity of the polymer for mixed adsorbate is increased, compared with the singleadsorbate.